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Related Experiment Videos

From IgG monoclonals to IgM-like molecules.

M Ernst1, D Meier, H H Sonneborn

  • 1Biotest AG, Research Department, Dreieich, Germany. manfred_ernst@biotest.de

Human Antibodies
|February 26, 2000
PubMed
Summary
This summary is machine-generated.

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Researchers engineered IgG antibodies into IgM-like molecules to improve erythrocyte agglutination in blood group testing. This molecular approach enhances diagnostic capabilities for Rh blood group antigens.

Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • Immunoglobulin G (IgG) monoclonal antibodies often fail to agglutinate erythrocytes due to high zeta potential, hindering blood group testing.
  • Human monoclonal antibodies against Rh blood group antigens, particularly c-antigen subgroups, are frequently IgG and lack agglutinating properties.

Purpose of the Study:

  • To develop a molecular method for converting IgG monoclonal antibodies into IgM-like molecules with enhanced agglutination capabilities.
  • To engineer a novel single-chain variable fragment (scFv) construct for improved blood group antigen detection.

Main Methods:

  • Isolation of mRNA from a c-antigen specific IgG hybridoma (BS 240) and subsequent cDNA synthesis and PCR amplification.
  • Cloning of heavy and light chains into a vector for producing single-chain variable fragments (scFv), followed by screening for antigen specificity.

Related Experiment Videos

  • Fusion of scFv DNA with DNA coding for core streptavidin to create tetrameric scFv::strep constructs for enhanced agglutination.

    • Main Results:

    • Successfully produced antigen-specific scFv fragments from IgG monoclonal antibodies.
    • Engineered scFv::strep constructs demonstrated binding to biotin and effectively agglutinated c-antigen positive erythrocytes.
    • The developed scFv::strep molecules showed improved agglutination compared to original IgG antibodies.

    Conclusions:

    • It is feasible to engineer IgM-like agglutinating molecules from IgG-secreting hybridoma cells.
    • This molecular strategy offers a promising approach to overcome limitations in blood group testing diagnostics.
    • Further research is underway using human antibody libraries to expand this technique.